I have heard of some stories that AT&T charging people for excesive data usage. This is due from people tethering their iPhones to their laptops. Has anybody been caught using Pdanet 1.40? I also heard that the way AT&T catches you is because no default app like Youtube, Safari, App Store, iTunes Store, and Mail do not use a significant amount of data in the background. So if they see that you have been using a lot of data without any of these apps opened they will charge you? Can anyone confirm this?